Professional Tube Testing
This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured transconductance(GM): 1.81/1.64 mA/V - 113%/103% (100% = 1.6 mA/V)
Measured plate current(IA): 1.427/1.255 mA - 119%/105% (100% = 1.2 mA)
Tube 2:
Measured transconductance(GM): 1.84/1.65 mA/V - 115%/103% (100% = 1.6 mA/V)
Measured plate current(IA): 1.555/1.51 mA - 130%/126% (100% = 1.2 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Appearance & Cosmetic condition
This pair stands out aesthetically among the vintage tubes with pristine cosmetic condition. Nearly 100% of the silkscreen is well preserved and the IDENTICAL acid-etched Heerlen date codes are perfectly visible on both tubes:
mC2 ⊿6L (mC2 = ECC83 Long Plates production gen #2, ⊿ = Heerlen, 6 = 1956, L = December)
Single Tube - Strong
Philips ECC83 12AX7 Foil D 45° Getter 17mm Long Plates mC2 - Single Tube - Heerlen, NL '56 - Strong
$318.75
Professional Tube Testing
This tube was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured transconductance(GM): 1.1/1.29 mA/V - 69%/81% (100% = 1.6 mA/V)
Measured plate current(IA): 1.255/1.277 mA - 105%/106% (100% = 1.2 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Appearance & Cosmetic condition
This tube stands out aesthetically among the vintage tubes with pristine cosmetic condition. Nearly 100% of the silkscreen is well preserved.
mC2 ⊿6K (mC2 = ECC83 Long Plates production gen #2, ⊿ = Heerlen, 6 = 1956, K = November)
Single Tube - NOS+
Philips ECC83 12AX7 Foil D 45° Getter 17mm Long Plates mC2 - Single Tube - Heerlen, NL '56 - NOS+
$488.75
Professional Tube Testing
This tube was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured transconductance(GM): 1.79/1.88 mA/V - 112%/118% (100% = 1.6 mA/V)
Measured plate current(IA): 1.42/1.6 mA - 118%/133% (100% = 1.2 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
Appearance & Cosmetic condition
This tube stands out aesthetically among the vintage tubes with pristine cosmetic condition. Nearly 100% of the silkscreen is well preserved.
mC2 ⊿6L (mC2 = ECC83 Long Plates production gen #2, ⊿ = Heerlen, 6 = 1956, L = December)
